I find it better when using plant labels just to write a number on them and
have a sheet of paper (or on the computer) with details of what is planted
against each number.

There are three advantages to this:
1) There is more room to write information such as where the seeds or
cuttings etc came from, when planted, variety and any other notes.
2) By just having a number on the plant label, the number can be written in
several places on the label so it appears on both sides and both above and
below ground (the below ground number doesn't fade so fast).
3) The labels can be reused without needing to rub anything out. Just update
the sheet of paper or computer record.

--
David
.... Email address on website http://www.avisoft.co.uk